Glass-polishing apparatus



June 12, 192s.4 1,673,733

C. H. CHRISTIE GLASS POLISHING APPARATUS Filed Nov. 16, 1926 Patented June 12, 1928.

UNITED STATES CHARLES H. CHRISTIE, OF BUTLER, PENNSYLVANIA.

GLASS-POLISHING APPARATUS.

Application tiled November 16, 1926.

My invention relates to glass polishing apparatus, and particularly to the construir tion ot polishing blocks for linisliing plates ot glass.

This invention constitutes an improve- 'nient upon that disclosed in my Patent #1,610,658, issued Dec. 14, 1926, which deL scribes and claims a telt-supporting member that may be attached to or detached from a in polishing block without disturbing the bloolr. ln said patent, the telt-holding member is disposed circnmi'erentially ot the block.

It is the purpose ot the present invention to provide means whereby the telt-holding .l5 member is rigidly held against upward movement relative to the block, so that there will be unitorinity in wear as between those portions ot 'the felt beneath the block and those portions beneath the felt-holding meni- 213 bei'. Furthermore, by iny improved arrangement, the eliective polishing area of a given head is increased.

One forni which my invention may take is shown in the accompanying drawing, where in Fig. l is a vertical sectional View of a polishing block embodying my invention, and taken on the line I-I ot Fig. 2; Fig.

2 is a plan view of the apparatus of Fig. l,

and Fig. 3 is a cross sectional view showing modification or' the apparatus of Figs.

1 and 2.

I have shown my invention as embodied in. a polishing block 5, preferably of cast iron, that is supported upon a stem 6. Us-

ually a plurality of blocks and their stems are mounted upon a rotatable spider or polishing head and are bodily moved in annular paths about the center of rotation of the spider or cam, to polish glass that is 4o moved beneath the saine. In operation, the blochr 5 has idle rotative movement about its stem (i, by reason ot' its trictional engagement with the glass surface being polished.

The block 5 is connected to its stem 6 by means ot a follower plate 7 of cast iron or the like which holds the central recessed portion ot the block 5 against the ball-like lower end of the stem 6. The plate 7 is held in position by bolts 8 whose heads are supported in T-slots 9 in the block 5.-

A polishing pad 10 of telt or similar inaterial is provided and is removably applied to the block 5 by reason of the fact that it is held in clamping engagement with a re movable ring 11, by means ot' an annular band 12. The pad 10 is assembled with said Serial No. 148,690.

band and ring by placing one of said members beneath and the other above the felt and forcing them into concentric relation, thus bending the edges ot the telt to the position shown in Fig. l. The parts l0, 1l and 12 form a unit that is detachably secured to the polishing blocks by means of a screw stud 13 threaded into said block and having its outer end extending into a recess formed in the ring 11. Diainetrically opposite to the stud 13, the block 5 is provided with a recess 14, and a hole 15 within which is contained a locking pin 16. As shown in the drawing, one end ot the locking pin eX- tends through the opening 15 into a hole in the ring 11, the other end of the pin 1G lying in the recess lei so that the outer end thereof is held in locking engagement with the ring 1l. To release the ring 11 the inner end ot the pin 16 is raised and the entire pin may then be slid backwardly into the recess 17 ot the block. rlhe lett hand side of the ring 11 is then lowered and the ring with its contained pad 1U and the band 11 moved to the right to clear the stud 13.

lt will be seen that the polishing block 5 need not be disturbed and that it is only necessary to carry extra pads 10 and bands 11 and 12 in assembled condition in order to quickly replace Worn pads. Frequent changes of telt are sometimes required because chips of glass or foreign matter be come imbedded in the telt.

The block 5 is provided with tour bosses or projections 18 that extend across the upper edge ot the ring 11, so that such ring will bear a portion ot the weight ot the block and be held against upward movement relative to the block, this :tor the reason that the block 5 is oit Very greatl weight relative to the ring l1. It the ring were not held down tightly against the glass, that portion of the lelt directly beneath the body ot the block 5 would be Worn away quite rapidly and, owing to the small amount oit pressure that Would be exerted by the ring 11, the felt beneath the ring would not be subjected to very great friction, so that not only would there be an uneven wear of the telt, but a loss in the effective polishing area would result. T he bosses 18 are spaced from the stud 13 so that there will be a minimum interference thereby to tilting and removal of the ring 11.

In Fig. 3, I have shown a moditied arrangement Wherein all of the parts, except the block 5 andthe ring l1a are substantially as shown in Figs. 1 and 2. In this modiiied arrangement, the block 5u is undercut and the ring 11a is inturned at its lower edge so that it is angular in cross section, and ythe lower flange of this angle fits within the cut-out portion of the block. The bottom face ol such iange is flush With the bottom face of the block 5 so that a portion Vof the Weight of the block 5 is imposed upon the ring 1l and that portion of the felt beneath thering lis held in close contact; With the glass.

I claim as my invention:

1. The combination with a glass polishing block, of a ring, Va polishing pad supported by said ring and having its edge upturned and held yagainst the periphery of Athe ring, and means for `detachajbiy securing said ring to `said block, the block being provided with an integral 4portion over-hanging and directly engaging an upper `portion of saidring in order to rigidly support the ring against upward movement relative to the block.

2. Glass polishing structure comprising a block, a polishing pad, a supporting member for the pad .disposed Within ,the peripheral boundary thereof, and `means for detachably securing said supporting member to said block, .the said block being provided With an overhanging portion .that extends fora substantial distance circumferentially ,thereof and rigidly holds said supporting member against upward movement relative to the block.

3. Glass polishing structure comprising an annular block, a ring-like member adapted to loosely surround said block, a polishing pad, and means for seeurinor said pad to said ring-like member, the saif block being provided with an integral portion that rigidly holds said supporting member against upward movement relative to the block, and

the said ring-like member being disposed within the peripheral boundary of said pad.

el. .Glass polishing structure` comprising a block, a pad-holding member disposed against the side of said block, the bottom surface of the atl-holding member being flush with the bottom surface of the block, a pad Zextending ventirely across said bottom surfaces, and .an integral shoulder on said block for rigidly supporting the pad-holding` member against upward movement relative to nhe block.

5. ,Glass polishing structure, comprising a block, la pad-holding member disposed against the side of said block, a pad covering the entire lower surfaces or' the padholding member and the block and means rigidly connected to said block, for restraining said member against upward movement relative to the block.

In testimony whereof I, the said CHARLES H. CHmsTJE, have hereunto set my hand.

CHARLES H. CHRISTIE. 

